pub struct Page<K: ?Sized, V: ?Sized> { /* private fields */ }

Trait Implementations§

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impl<K: UnsizedStorable + ?Sized + Debug, V: UnsizedStorable + ?Sized + Debug> BTreeMutPage<K, V> for Page<K, V>

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fn init(page: &mut MutPage)

Initialise a page.
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type Saved = (*const K, *const V)

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fn save_deleted_leaf_entry(k: &K, v: &V) -> Self::Saved

Save a leaf entry as a replacement, when we delete at an internal node. This can be a pointer to the leaf if the leaf isn’t mutated, or the actual value, or something else.
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unsafe fn from_saved<'a>(s: &Self::Saved) -> (&'a K, &'a V)

Recover the saved value.
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unsafe fn put<'a, T: AllocPage>( txn: &mut T, page: CowPage, mutable: bool, replace: bool, c: &PageCursor, k0: &'a K, v0: &'a V, k1v1: Option<(&'a K, &'a V)>, l: u64, r: u64 ) -> Result<Put<'a, K, V>, T::Error>

Add an entry to the page, possibly splitting the page in the process. Read more
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unsafe fn put_mut<T: AllocPage>( txn: &mut T, page: &mut MutPage, c: &mut Self::Cursor, k0: &K, v0: &V, r: u64 )

Add an entry to page, at position c. Does not check whether there is enough space to do so. This method is mostly useful for cloning pages.
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unsafe fn set_left_child(page: &mut MutPage, c: &Self::Cursor, l: u64)

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unsafe fn update_left_child<T: AllocPage>( txn: &mut T, page: CowPage, mutable: bool, c: &Self::Cursor, l: u64 ) -> Result<Ok, T::Error>

Update the left child of the position pointed to by the cursor.
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unsafe fn del<T: AllocPage>( txn: &mut T, page: CowPage, mutable: bool, c: &PageCursor, l: u64 ) -> Result<(MutPage, u64), T::Error>

Delete an entry on the page, returning the resuting page along with the offset of the freed page (or 0 if no page was freed, i.e. if page is mutable).
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unsafe fn merge_or_rebalance<'a, T: AllocPage>( txn: &mut T, m: Concat<'a, K, V, Self> ) -> Result<Op<'a, T, K, V>, T::Error>

Merge, rebalance or update a concatenation.
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impl<K: UnsizedStorable + ?Sized, V: UnsizedStorable + ?Sized> BTreePage<K, V> for Page<K, V>

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fn is_empty(c: &Self::Cursor) -> bool

Whether this cursor is at the end of the page.
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fn is_init(c: &Self::Cursor) -> bool

Whether this cursor is strictly before the first element.
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type Cursor = PageCursor

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fn cursor_before(p: &CowPage) -> Self::Cursor

Returns a cursor set before the first element of the page (i.e. set to -1).
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fn cursor_after(p: &CowPage) -> Self::Cursor

Returns a cursor set after the last element of the page (i.e. to element n)
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fn split_at(c: &Self::Cursor) -> (Self::Cursor, Self::Cursor)

Splits the cursor into two cursors: the elements strictly before the current position, and the elements greater than or equal the current element.
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fn move_next(c: &mut Self::Cursor) -> bool

Move the cursor to the next position. Returns whether the cursor was actually moved (i.e. true if and only if the cursor isn’t already after the last element).
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fn move_prev(c: &mut Self::Cursor) -> bool

Move the cursor to the previous position. Returns whether the cursor was actually moved (i.e. true if and only if the cursor isn’t strictly before the page).
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fn current<'a, T: LoadPage>( txn: &T, page: Page<'a>, c: &Self::Cursor ) -> Option<(&'a K, &'a V, u64)>

Returns the current element, if the cursor is pointing at one.
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fn left_child(page: Page<'_>, c: &Self::Cursor) -> u64

Returns the left child of the entry pointed to by the cursor.
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fn right_child(page: Page<'_>, c: &Self::Cursor) -> u64

Returns the right child of the entry pointed to by the cursor.
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fn set_cursor<'a, T: LoadPage>( txn: &'a T, page: Page<'_>, c: &mut PageCursor, k0: &K, v0: Option<&V> ) -> Result<(&'a K, &'a V, u64), usize>

Sets the cursor to the last element less than or equal to k0 if v0.is_none(), and to (k0, v0) if v0.is_some(). If a match is found (on k0 only if v0.is_none(), on (k0, v0) else), return the match along with the right child. Read more
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fn cursor_first(p: &CowPage) -> Self::Cursor

Returns a cursor set to the first element of the page (i.e. 0). If the page is empty, the returned cursor might be empty.
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fn cursor_last(p: &CowPage) -> Self::Cursor

Returns a cursor set to the last element of the page. If the cursor is empty, this is the same as cursor_before.
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fn next<'b, T: LoadPage>( txn: &T, p: Page<'b>, c: &mut Self::Cursor ) -> Option<(&'b K, &'b V, u64)>

Return the element currently pointed to by the cursor (if the cursor is not before or after the elements of the page), and move the cursor to the next element.
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fn prev<'b, T: LoadPage>( txn: &T, p: Page<'b>, c: &mut Self::Cursor ) -> Option<(&'b K, &'b V, u64)>

Move the cursor to the previous element, and return that element. Note that this is not the symmetric of next.
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impl<K: Debug + ?Sized, V: Debug + ?Sized> Debug for Page<K, V>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<K: ?Sized, V: ?Sized> RefUnwindSafe for Page<K, V>

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impl<K: ?Sized, V: ?Sized> Send for Page<K, V>
where K: Send, V: Send,

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impl<K: ?Sized, V: ?Sized> Sync for Page<K, V>
where K: Sync, V: Sync,

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impl<K: ?Sized, V: ?Sized> Unpin for Page<K, V>
where K: Unpin, V: Unpin,

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impl<K: ?Sized, V: ?Sized> UnwindSafe for Page<K, V>
where K: UnwindSafe, V: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.